Alternating-current regulator.



U. H. THORDARSON. ALTERNATING CURRENT REGULATOR.

APPLICATION FILED JULY 27, 1906.

Patented May 11, 1909.

' current in'the energizing circuit.

CHESTER H. THORDARSON, OF OEICAGO, ILLINOIS.

ALTEBNATING-GUERENT GULATOE.

Specification of Letters Patent.

Patented May 3.1, 3.909.

Application filed m 27, 1906. Serial No. 328,185.

To all whomit may concern:

Be it known that I, CHESTER H. THORDAR- SON, a citizen of the United States, of Chicago, in the county of Cook and State of Illinors, have invented certain new and useful.

Improvements in Alternating-Current Regulators; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of ref erence marked thereon, which form a part of this specification.

s invention relates to improvements in electric current regulators and refers more particularly to such regulators as are adapted by inductive impedance to regulate the current ofan alternating current circuit.

Among the objects provide an exceedingly simple compact and efficient regulating device for this purpose and the invention consists in the matters hereinafter set forth and more particularly pointed out in the appended claims.

I have shown my regulating device as aplied to an apparatus for generating X-ray lights, it being introduced into the generating circuit in a manner to act by impedance to vary the amount of current passed through the circuit and o crates in such manner that the value of t e current may be graduall raised or lowered and the intensity of t e X-ray light generatedthereby correspondingly varied. vice, being shown in connection with X- ray light apparatus Willb'? hereinafter'dd scribed in this connection and relation but it will be understood that my improvements may be employed for other regulating purposes to which it may be adapted.

Referring to the drawings z-Figure 1 is a diagram of the circuits and the essential instrumentalities included therein which go to .malre up X ray apparatus. l ig. 2 is a side elevation of one form of the amount of Fig. 3 is a 3 3 of Fig. 2. Fig. l of said device. 5 plates constituting the laminated portion of the frame of said regudevice. Fig. 6 is a like view of a similar-plate which goes to make up the lamisated coreoi said regulating device.

As shown ins'ai-d draw 'n'gs,-l indicates source or" alternating current, and 9 consection'talren on line is a top plan view illustrates one of the The regulating de-v plates J J and ductors connecting said source with the pri mary coil E of the high potential transformer. F designates thesecondary coil of said transformer, connected by conductors F F with the usual discharge terminals).

G designatesthe usual vacuum or Croo es tube, the electrodes 9 9 ed by conductors g g ductors F F transformer.

The impedance regulating mechanism herein shown comprises a coil H in series with the primary side of the high potential transformer, a core I which, as herein shown, is movable into and out of the coil, and a suitable frame, designated as a Whole in Fig. las J. The core is made of variable cross sectional area in the portion thereof which is of which are connect- With the terminal conof the secondary circuit of the adapted to move into and out of the coil, it

being herein shown as wedge sha ed or tapered from its upper to its lower or caring surface, which latter is fiat? The said regulating mechanism is shown in detail in Flgsl 2 to 6, inclusive, and is made as follows:

The frame, designated by J in Fig. 1, com prises, as shown in the other figures, two side lates J J, and an intermediate laminated ody 5 consisting of plates 9' of magnetic material (shown in detzu in Fig. 5) confined be tween said side plates by means of traverse bolts j y (Figs. 2 and 4). The said side the intermediate plates J of the'body are cut away to provide upwardly opening recesses, the recesses of the interme- -d1ate plates being designated as j in Fig. 5, to receive the coil'l-l which is confined between flanges 9' extending laterally and oppo'sitely from the side plates of said frame.

The core I slides on the upper surface of the laminated body J into and out of the coil H, as indicated by full and dotted lines in Fig. 1. Said core is also of laminated con struction, it comprising a plurality of thin plates or lamina t oi magnetic material (Figs. 3, 4 and 6), confined together between side plates 1 I fixed together by means of bolts i 7? extending transversely between and through said plates. Said plates tare shown as tapered at both ends from their lower bearing surfaces to their top surfaces to provide the variable area of the cart of the core which moves into and out oft e coil and also to provide at the other end of'the core an extension adapted to be engaged by an operating part to give movement to the core.

frame which greatly increases the inductive capacity of the core and this ironpath is 'maintamed throughout a large part of the range of adjustment of the core. The tapered arrangement of the core and metal to metal'contacts of the core with the frame enables the current to be gradually varied within close limit, thus avoiding objectionable fluctuation or abrupt variation in the regulated current. Guide bars K fried to the side frames J J as by means of bolts is, engage u wardly opening rabbets in the side plates of the core and serve to'hold the core from rising. The side plates J are provided with extensions 7' which support the core when the latter occupies a position withdrawn from the core. The rails Kalso extend outwardly over said extensions 3' movement of the core into and out of the coil comprises a rotative shaftL mounted in a suitable bearing J extending laterally from one of the side plates J andprovided at its rack 1 formed on the lower margin of one of the side members or plates 1 of the core. Said shaft L is provided at its outer end with a hand-wheel L by which it is rotated to advance or retract the core as desired.

Means may be provided for locking the core in any position, of adjustment. Means for this purpose is herein shown and consists of a locking screw M having screw-threaded engagement with a bracket J on one of the side platesof. the frameand bearing at its lower end against the adjacent guide bar K,

the latter for this purpose having a slight vertical movement so as to be pinched downwardly against the bottom of the rabbet occupied thereby in the plate I ofthe core.

For this purpose the aperture in said bar K,

through which the ad acent fastening screw k passes, is made somewhat larger than said 55 screw, as shown in Fig. 3. I

The members of the conductor C are connected with the coil through binding screws N located-at. one side of the frame, near the base thereof (F' s52 and 3) and mounted on an insulating b ock N afiixed' to said side plate;

Injthe operation of'the apparatus, after the tube is adjusted to the a paratus and the enerating circuit closed, t e core I is adusted into and out of the coil H until the variations.

as to move the core into and out of the coil,

The means herein shown for effecting inner end with a pinion L that engages a rent a paratus comprising a ma netic slidable on sai coil and, having contact with the frame on 120' l desired intensity of the ray has been attained.

Thereafter the coil may be locked in position by the locking screw M.

An important advantage of the regulating mechanism herein described arises from the fact that the quantity of the current may be gradually'varied within close limits, thereby producing uniform variations .of the X ray efiectsin the tube, and free from abrupt Said regulating apparatus pro duces particularly good results when employed in alternating currentjcircuits, inasmuch as both the character of the current and the manner of its regulation conduce to a regular and uniform X ray effect in the tube, thereby producing a ray not only well adapted to a given or predetermined use, but also one that is free from fluctuations and de-. viations from a standard or desired eflect.

I claim as my invention 1. A regulating device for alternatlng current apparatus comprising a coil, a frame upon which said coil is su ported, and a core, the core and coil being re atively movable so said core being of variable cross-sectional area in the part thereof which moves into and out of the coil.

2. A regulating devicefor alternating current apparatus comprising a coil, a frame upon which said coil is su ported and a core,

the core and coil being rellitively movable so as to move'the core into and out of the coil, said core being of variable cross-sectional area in the part thereof which moves into and out of the coil, and the core being so arranged relatively to the frame that throughout a large part its range of adjustment it completes with the frame a continuous iron path for the magnetic lines emanating therefrom.

3. A regulating devicefor alternating current a paratus comprising a magnetic frame provi ed with a transverse recess to partially receive a coil, a coil supported in said recess and a tapered core slid able on the frame into and out of the coil and arranged to have contact 'withthe frame on both sides of said recess.

4. A regulating device for alternatin curframe provi ed with a recess to partia ly receive a coil, a coil sup orted in said recess, a core frame into and out of said both sides of saidrecess, and a rack and pinion mechanism for giving movement to said. core.

5. A regulating device for alternating current a paratus comprising a magnetic frame provi ed with an upwardly facing bearing surface and with an upwardly opening recess, a coil supported in said recess, a core sup orted on t e upwardly facingbearin sur ace of the frame and movable into an rent apparatus comprising a magnetic frame out of said coil, and guides on the frame en- '8. A regulating device for alternatin curgaging the core to prevent it rising fromsaid l rent zzpparatus comprising a magnetic rame 25 rame. provi ed with a transverse recess to receive a 6. A regulating device for alternatin 'curcoil, a coil supported in said recess, a core rent apparatus comprising a magnetic frame l slidable longitudinallyon the frame into and provic ed with an upwardly facing bearing P out of the coil, said core being of laminated surface and with an upwardly opening re- 'construction, it comprising a plurality of fiat 30 cess, a coil sup orted in said recess, a core l plates tapered at their ends from their bearsup orted on t e upwardly facing bearing ing margins toward their opposite margins su ace of the frame and movable into and and suitably clamped together, said core beout of said coil, and an end extension on the ing arranged to engage the framevon both frame arranged to support the core as it is 4 sides of the recess and to maintain said en- 35 withdrawn from the coil. gagement throughout a considerable portion 5 of range of adjustment of the core.

In testimony, that I claim the foregoing as provided with a transverse recess to receive l my invention I afiix my signature in resence the coil, a coil supported in said recess and a f of two witnesses, this 21st day of July A. D. 40 core slidable longitudinally on the frame f 1906. into and out of the coil, said core comprising l 7. A regulating device for alternatin cur-' a plurality of flat metal plates confined be- I I CHESTER THORDARSON tween side framesand guides on said side l Witnesses: frames engaging parts on the magnetic frame i W. L. HALL,

to guide the coil into and out of the core. 5 GEORGE R. WrLKINs. 

